So far you have diagnosed your problem roughly but you need to track it down even more. You need to understand what patterns that causes your problems and then practise these patterns many many times using finger independency exercises.
Most likely, your problems consists of a 3 or 4 key pattern (I will not go into a discussion why this is the case, I refer to Chang for more information). For 3 key patterns, you got 10 finger combinations which all can produce 6 patterns.
The combinations are 1-2-3, 1-2-4, 1-2-5, 1-3-4, 1-3-5, 1-4-5, 2-3-4, 2-3-5, 2-4-5 and 3-4-5. The first combination of 1-2-3 can have the following 6 variations:
1-2-3, 1-3-2, 2-1-3, 2-3-1, 3-1-2, 3-2-1. If you play them over and over again with a rhytmic steady beat, there are actually only 2 variations (up or down) but it gets rhytmically more difficult if the metronome click is located at the middle finger for example so all 6 patterns are valid to practise. So all together, you got 60 different patterns. Try to figure out which ones that matches your problem and you have the magic formula to eliminte your problems.
For 4 key patterns, there are only 5 combinations as you leave out only 1 finger at the time. But each pattern has 24 variations which ends up in a total of 120 different patterns.
Then we have the 2 and 5 finger combinations which you can figure out by yourself but as I said before, the problem is likely within a 3 or 4 finger pattern.
Piano playing is actually all about finger independence and what we do when we practise these exercises is to practise the brains capability to control the fingers. Practise to metronome and with a speed you can control. Try different variations of black and white keys until you have diagnosed your problem. Then repeat the exercise that fits about 100-200 times a day and gradually increase the speed.
This is much more efficient than to learn a whole new etude (unless you have a second reason to learn it) and will hopefully save a lot time. Take your time to find the problematic patterns. It should not take long and then spend maybe 4-5 days doing the exercises that match and you will most likely notice a great improvement.
Good luck!